There are exceptions, but found chiefly among parasites, among the degraded, like the xenos which lives without distinction upon wasps, coleoptera, and neuroptera. The male is provided with two large wings; the female has neither wings, feet, eyes, nor antennæ; is a small worm. After metamorphosis the male emerges, flies a little, then returns to the female who has remained inside the nymphal envelope, and fecundates her in her wrappings. Other exceptions, this time normal, are furnished by butterflies, that is to say by a sort of insect which is very placid, and which, at least in the winged form, is addicted neither to hunting nor to any trade or business function. One gives the name "psyche" to a very small butterfly which flutters out rather clumsily in the morning; it is the male. The female is a huge worm, fifteen times as long, ten times as fat. The lovers are in the proportion of a cock to a cow. Here the feminism is wholly ludicrous. There is the same disproportion in the mulberry bombyx, of which the female is much heavier than the male; she flies with difficulty, a passive beast who submits to a fecundation lasting several hours; likewise in the autumn butterfly, cheimatobia, the male sports two pairs of fine wings on a spindle body, the female is a gross fat keg with rudimentary wings, incapable of flight; she climbs difficultly into trees on whose buds her caterpillar feeds itself; in the case of another butterfly which one calls, absurdly, the orgye, the male has all the characteristics of lepidoptera, the female is almost wingless with a heavy and swollen body and a carriage about as pleasing as that of a monstrous wood-louse; there is the same disproportion in the graceful, agile and delicate liparis, known as the zig-zag because of his wing-markings; he would hardly discover his mate without aid from instinct, she being a whitish beast with heavy abdomen ruminating motionless in the tree-bark. Neighbouring species, the monk, the brown-rump, the gold-rump show hardly any sexual differences.